Programmers
Q&A for professional programmers interested in conceptual questions about software development
Photography
Q&A for professional, enthusiast and amateur photographers
The Workplace
Q&A for members of the workforce navigating the professional setting
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Physics
Q&A for active researchers, academics and students of physics
Mathematics
Q&A for people studying math at any level and professionals in related fields
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Server Fault
Q&A for professional system and network administrators
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
WordPress Answers
Q&A for WordPress developers and administrators
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Ask Different
Q&A for power users of Apple hardware and software
User Experience
Q&A for user experience researchers and experts
The Great Outdoors
Q&A for people who love outdoor activities, excursions, and outdoorsmanship
Politics
Q&A for people interested in governments, policies, and political processes
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Biology
Q&A for biology researchers, academics, and students